1. Welding materials for welding pressure vessels include electrodes, wires, steel strips, fluxes, gases, electrodes and gaskets.2. Selection principle of welding materials: According to the chemical composition, mechanical properties and welding performance of the base metal, and combined with the structural characteristics, operating conditions, welding methods and manufacturing processes of the pressure vessel, the welding materials are selected comprehensively, for example: ① Stress and pressure welding For joints, firstly, the welding materials should be selected according to the principle of joint strength; ②For the welding structure working at low temperature, the low-temperature toughness of each area of the joint should be ensured first, which is more important than the strength of the joint; ③For containers with only corrosion tendency, first ensure the container Corrosion resistance of the parts where the inner wall is in contact with the medium; ④ Secondly, consider the processing technology of the welded structure, such as shearing, cold stamping, cold coiling, hot coiling and the influence of various heat treatment processes on the joint performance (cold stamping, shearing and cooling Coiling and other processes require welding joints to have high plastic deformation capacity; while hot coiling and heat treatment processes require joints